Great article! Really brings to life the lightweight methods that this site is all about.
DIY flocculants? Never occurred to me, but I would be interested in learning more... Dosing, sourcing, alternatives, etc.
I have heard the hiss of silt-laiden waters a time or two myself on a spring Salmon River trip in Idaho - it's one of those little known and seldom observed phenomenons that you feel privileged to witness.